[coreboot-gerrit] Change in coreboot[master]: depthcharge: Fix ominous warning on make clean

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Change subject: depthcharge: Fix ominous warning on make clean
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Patch Set 2:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/58077/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/13510/ : SUCCESS